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Chebyshev's theorem is used to approximate the proportion of observations for any data set, regardless of the shape of the distribution. Assume that a distribution

Chebyshev's theorem is used to approximate the proportion of observations for any data set, regardless of the shape of the distribution. Assume that a distribution has a mean of 255 and standard deviation of 20.

a) Approximately what proportion of the observations is between 215 and 295?

b) Approximately what proportion of the observations is between 225 and 285?

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